经排水固结的中心排水注浆混凝土桩承载特性数值分析

为获得经排水固结的中心排水注浆混凝土桩单桩复合地基承载性状,通过数值分析手段,对中心排水注浆混凝土桩和普通预制混凝土桩进行单桩复合地基静载荷试验对比研究,以此分析荷载-沉降曲线、桩体轴向应力、桩体侧摩阻力以及桩-土应力比等特征规律。结果表明,相比普通预制混凝土桩单桩复合地基,中心排水注浆混凝土桩单桩复合地基承载力提高了约120%,可见应力集中现象显著降低,桩周土承载力得到增强,桩周土载荷能力发挥程度得到改善。研究成果可为中心排水注浆混凝土桩单桩复合地基工程应用提供理论指导。

Numerical analysis on bearing performance of central drainage and grouting concrete pile after drainage consolidation

In order to aiming at the bearing characteristics of Central drainage and grouting concrete pile after drainage consolidation, based on the numerical calculation of plate load tests on single-pile composite foundation between Central drainage and grouting concrete pile and and Ordinary precast concrete pile, the results was used to analyze the characteristics of load-settlement curve, axial stress, the lateral friction and the pile-soil stress ratio.The calculation results show that, compared with single-pile composite foundation of the Ordinary precast concrete pile, the bearing capacity of the single-pile composite foundation with central drainage grouting concrete pile is increased by about 120%, It concluded that the phenomenon of stress concentration is reduced, and the bearing capacity of the surrounding soil is enhanced, and the degree of self-loading capacity is improved. It can provide theoretical guidance for the engineering application of single-pile composite foundation with Central drainage and grouting concrete pile.